I tend to agree with Jonathan Lis, Of course it's still possible that the EU might blink, but I think it's much much more likely that Boris Johnson is indeed miscalculating and it won't. Which in turn will either trigger the U-turn of the century or the shortest premiership possible for Johnson. Because despite all the Blitz/Dunkirk/Bulldog Spirit propaganda, the British public will not accept the disruption no deal is likely to bring, especially because almost 50% voted against Brexit anyway and of the 50% leave voters the vast majority didn't vote for no deal (despite the assertions of Vote Leave etc).